This talk by Chris Grayson contains lots of information about how to enter the so-called "hackerspace." From mental approaches to books, movies, and other media to online courses and knowledge repositories, this presentation is intended to be the one-stop-shop for anyone trying to become a penetration tester.

A disk is divided into sixteen pie pieces and unrolled along the circumference. The resulting row of spikes is then split in two, one half is rotated and placed interlocking with the other half. Below, another disk is unrolled into a continuous gradient, simulating infinitesimal spikes. It is similarly split, rotated, and merged with the other half.